GENERAL ANATOMY OF THE MAMMALIAN BODY II 
Pry open the mouth and demonstrate, by probing, the con¬ 
nection of each of these passages with the pharyngeal cavity into 
which the mouth cavity leads posteriorly. The large jugular 
vein is conspicuous upon either side of the neck. Of the glandular 
masses, the salivary glands are the most conspicuous, although 
numerous lymph nodules are present. There are three pairs of 
salivary glands each gland connected by a slender duct with the 
mouth cavity. The thyroid (thyreoid) glands are in most forms 
closely applied to the lateral surface of the larynx and trachea. 
Add to the drawing already begun the ventral view of the thoracic 
and the neck viscera in situ. 
2. The Neural Cavity 1 and Its Contents in situ . 
Place the specimen with the dorsal surface up and remove the 
muscle masses from the lateral and posterior surfaces of the skull 
and from the dorsal surface of the vertebral column. With bone 
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forceps and strong scissors carefully remove the dome of the 
cranium bit by bit, and the dorsal portions of the consecutive 
vertebrae and thus lay open the neural cavity. In the cranial 
region observe the brain covered by the meninges which are con¬ 
tinuous throughout the whole neural cavity. The meninges may 
be removed to expose the dorsal surface of the brain. From this 
aspect the two cerebral hemispheres, the cerebellum and the 
posterior part of the medulla may be seen, the latter continuous 
posteriorly with the spinal cord which lies in the tubular spinal or 
vertebral region of the neural cavity. 
Draw a dorsal view of the animal showing the brain and spinal 
cord in situ. 
3. The Digestive System. (For comparison use demonstration 
preparations of other mammals and human manikins and 
models.) 
Preliminary Dissection. —To expose the anterior region of the 
digestive tract, the trachea, heart, and lungs must be removed. 
This is most conveniently done by lifting up the anterior region 
1 The dissection of the neural cavity should be made upon the first or second day, 
before the brain and spinal cord have begun to soften, or, if the specimen is to be 
preserved in formalin or alcohol, the cavity should be opened enough to permit the 
entrance of the preserving fluid. If the time is too short to admit of this dissection, 
it may be given by the teacher upon a fresh specimen as a demonstration. 
